Liquid-fuel-burning furnace



April 17, 1928. 1,666,747

J. MCDONALD LIQUID FUEL BURNING FURNACE Filed Sent. 27. 1923 2 Sheets-Sheet l Tizil.

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- ATTORNEY April 17, 1928. 1,666,747

' J. McDONALD LIQUID FUEL BURNING FURNACE Filed Sent. 27. 1923 2 Sheets-Sheet 9 INVENTOR WJ M ATTORNEY Fig. 3 showing both Patented Apr. 17, 1928.

UNITED STATES PATENT OFFICE.

JAMES MCDONALD,

me conroan'r on NEW Yoax,

ION, OF NEW YORK,

N. Y., nssrenon To WHITE Bunion. ENGINEER- Y., A oonronn'rron or NEW YORK.

Lremn-F EL-Bunmue rurm'acn.

- Application med September 21, 1923. serial No. 665,047.

, This invention relates to liquid fuel burning furnaces using natural draft and my improvements are directed to features and structural arrangements in a burner apparatus whereby it is enabled toserve the following among other purposes:

1. The burner apparatus-includes a double ing, each 'catmg means,

larger opening may be access only to the the furnace is fuel supply.

2. The air control characterized shut off to leave smaller opening when to be operated on a restricted means in and forming part of the apparatus are so devised and arranged that means to the of them closed, they baffles to prevent (ii of heat from the whether the air admission furnace be all open, or some at all times serve as rect outward radiation furnace.

3. Each of the vent-uri devices or air supply tubes are provlded with inwardly sloped or curved walls for the ing the flow of air toward the burner flame. Other features and advantages of my invention will hereinafter appear:

In the drawings: Figure 1 1S a top proved apparatus. for

plan view of my imnatural draft furnaces.

Fig. 2 1s a similar view showing the apparatus as swung open.

Fig.

3 is a forward elevation of a furnace having my improved apparatus applied thereto.

Fig. 4 is a side elevation thereof showing the air Fig. 5 is a Fig. 3, showing closed, and

Fig. 6 is supply means as fully open. section on the line the outer air supply means a section on the line 6-6 of inner and outer supply means in open position.

In said views let 1 of a furnace opening through wh are admitted for combustion.

indicate the front wall which is provided with an ich liquid fuel and air Entered within this opening is anair supply tube 2, generally termed a Venturi tube, it being pro- 3 by which it is secure vided with a flange to the furnace wall to provide the curve 1 as by bolts 4. This inwardly dished,

certain novel tube 2, is adapted purpose of centercentral clearance 6 of relatively large area for air admission.

An annulus 7, of the same diameter as to fit in aligned relation therewith, said annulus and tube being pivotally connected, as at 8, so that the annulus can be swung into both open and closed positions.

This ability of the annulus 7 to swing in the manner indicated is desirable because saidannulus carries the other elements of which the burner apparatus is composed, and obviously, when swung open, accessmay readily be had to the burner and other associated parts.

It is a feature of my present invention to provide restricted air supply means to the furnace when a proportionate liquid fuel supply is in operation for furnishing less than the maximum heat of which the furnace is capable.- To this end a smaller Venturi or air supply tube 9 is provided, being here shown as engaged with the annulus 7 by means of webs 10, which support it in the closed position of the apparatus in nested, spaced relation with the;air tube, 2. Said air supply tube 9 has the forward portion of its wall inwardly inclined, as at 11, for convergence of air-flowing there- .through, as with the larger air. tube 2;" and its opening 12 is of smaller diameter than the opening '6. Arms 13 which extend rearwardly from the interior surface of tube 9 carry a sleeve 14, which supports a burner tube 15 in slidable relation therewith, a set screw 16 serving to fix the burner tube in a set position. It should be 'notedthat the sleeve 14; carries a disk-like flange 17 whose f function will be referred to hereinafter.

An annular late or air control ring 18 and a cover p ate 19 are included among the elements of my burner apparatus construction, and will now be described. The

rin '18 is provided with tubular portions D 20. 20, slidably mounted respectively on guide posts as by nuts 22, in lugs 23, 23 extended from the interior-surface of air tube 9. The air control ring 18 .is therefore slidable to and from the outer peripheral edges of annulus d 7 and air tube 9; and, since these edges lie in the same vertical plane, the ring 18 21, 21 that are suitably secured,

may be moved against said edges to thus close the passage 24 which allows air to pass direct (to when the ring priate distance then answers the vent the direct to prevent direct'heatradiation.

The opening 26 through ring 18 serves for the passage of air to the smaller air supply tube 9 when'said ring is moved to close air passage 24.

I through the air control ring,

The cover plate '19, which is concavo-convex in form, is provided with bosses 27 27 by which it also is slidably mounted onthe posts 21, 21; and has a central opening 28, which air will pass to supply tube 9. This opening 28 is however guarded by disk 17, which serves as a bafiie to prevent direct radiation of furnace heat outwardly through said opening. Also, the outer ortion of opening 26 in -ring 18 is guarde' by the cover 19 toprevent the direct outward radiation of furnace heat. I

The means whereby the cover plate 19and air control ring 18 are interconnected and operated are as follows:

Bolts 29 secured as by nuts 30 tothe air control ring 18 extendoutwardly therefrom and pass freely through holes '31 provided therefor in the flange portion 32 of cover plate 19, nuts 33 limiting the extent of separating movement between the ring 18 and cover plate 19, but permitting the cover plate to be closed against the ring 18.

The posts 21 are each provided with teeth to provi e racks 34, 34, and toothed sectors 35, 35, carried by a shaft 36, revoluble in bearings 37, 37 on cover plate 19 are meshed respectively with said racks, said shaft being operable by' a handle 38 to move the cover plate to and from the furnace.

In Fig. 5 the air ring 18 is seen tobe in closed position, covering the air passa e 24, with the cover plate extended from sai ring 18 to the limit of their relative movement. In this osition of the several elements air is supplied to the furnace only through the openlng 12 of the smaller Venturi tube 9. By continued rotation of shaft 36 in the same direction, the toothed sectors will extend the outward movement of cover plate 19 to an adjustable-stop 19*, during which movement the air control ring 18, through connecting bolts 29, will also be withdrawn to the position shown in Figs. 4 and 6, thus permitting air to reach the lar er opening 6 through passage 24, besi es passing throughthe smaller air tube 9.

The air ring 18 may be locked in its set spaced position relatively to the cover plate by means of a catch member 39, pivoted to and having a handle by pose the central air wearer through said annular plate having a centrol clearance to expose the opening through the inner tube.

2. A burner apparatus for liquid fuel furnaces having apair of air supply tubes concentrically arranged to provi e an annular air passage and a central air inlet, the rear ends of said tubes being flush with each other, and an annular plate movable toward and from said rear ends to cover and uncover the space between said tubes said annular plate having a central clearance to expose the central air inlet.

. 3. A burner apparatus for liquid fuel furnaces having a. pair of air supply'tubes concentrically air passage and a central air inlet, the rear ends of said tubes other, an annular plate movable toward and from said rear ends to cover and uncover the space between said tubes, said annular plate having a central clearance to ex ose the con" tral air passage, and means in ependent of said plate for closing the inner tube.

4. A burner apparatus for liquid fuelfurnaces having a pair of air supplytubes concentrically arranged to prom e anannular arranged to provide anannular being flush with each air passage and a centraliair inlet, the rear ends oflsa'id tubes being f flush witheach other and an annular plate movable toward and from said cover the space between ,said' tubes, said an-.

,nular plate having a central clearance to expose the central air passage and beingfof greater diameter than'the' outer tube whereby 'to project therebeyond.

rear ends' to cover and un-' 5. A burner apparatus for liquid fuel furnaces having a pair of air supply tubes concentrically arranged to provi e an annular air passage and a central air passage, the

rear ends of said tubes being flush with each other, and a'n'annular plate movable toward and from said rear ends to cover and uncover the space between said. tubes, said annular plate having a central clearance to expassage and being of greater diameter than the outer tube whereby to project therebeyond, said projecting portion being inclined forwardly with :respect to the body of said plate.

6. A burner apparatus for liquid fuel furbeyond, the projecting portion able toward and from movable toward and from naces having a pair of air supply tubes concentrically arranged to provide an annular air passage, the rear ends'ofsaid tubes being flush with each other, an annular plate movable toward and from said rear ends to cover and uncover the space between said tubes, said annular plate being of greater diameter than the outer tube whereby to project therebeyond; and means independent of said plate for closing the inner tube.

7. A burner apparatus for liquid fuel furnaces having a pair of air supply tubeconcentrically arranged to provide an annular air passage, the rear ends of said tubes being flush with each other, an annular plate movable toward and from said rear ends to cover and uncover the space between said tubes, said annular plate being of greater diameter than the outer tube whereby to project therebeing inclined forwardly with respect to the body of said plate, and means independent of said plate for closing the inner tube.

8. A burner apparatus for liquid fuel furnaces having a pair of concentrically arranged air supply tubes and a central burner nozzle, said air supply tubes having their inner ends directed inwardly and their outer an annular plate the outer ends of said air supply tubes and proportioned to cover the space between said tubes when moved toward the same, and means to close the opening in said annular plate.

9. A burner apparatus for liquid fuel furnaces having a pair of concentrically arranged air supply tubes whose inner ends are directed inwardly and whose outer ends are in the same plane, an annular plate movthe. outer ends of tubes and proportioned to between said tubes when moved toward the same, and means to close the opening in said annular plate. said annular plate having its outer periphery projecting beyond the outer tube and inclined fqrwardly with respect to the body of the p ate.

10. A burner apparatus for liquid. fuel furnaces, having a relatively large air supply tube fitted thereto, an annulus in hinged relation to said supply tube, a relatively small air supply tube carried by said annulus and disposed in spaced relation to said supply tube of relatively large diameter, leaving a concentric passage between tubes, individual admission means to sm supply tubes, and means for controlling the individual admission means to the supply tube of relatively large diameter.

11. The combination with a liquid fuel furnace, of a relatively large air supply tube fitted thereto, an annulus in hinged relation to said supply tube, a relatively small air ends in the same plane,

said air supply cover .the space supply tube carried by said annulus an said supply dis osed in spaced relation within said annu us and said relatively large supply tube to provide a concentric intermediate passage, and an air control ring movable to close and open said passage.

12. The combination with a liquid fuel furnace, of a relatively large air supply tube fitted thereto! an annulus in hinged relation to said supply tube, a relatively small air supply tube carried bysaid annulus and disposed in spaced relation with said annulus and said relatively large supply tube to provide a concentric intermediate passage, and an air control ring movable to close and open said passage, said air ring when moved'to open said passage serving as a baflle to prevent the direct outward radiation of furnace heat.

13. The combination, with a liquid fuel furnace, an air supply tube therefor and a cover plate provided with a central opening and movable between its open and closed positions, of a central disk carried by said supply tube in spaced relation therefrom to serve as a bafile in preventing the direct outward radiation of furnace heat when the cover plate is moved to its open position.

1 1. The combination, in a liquid fuel furnace, of separate air supply means therefor of different capacities and respective closurev means for closing said supply means separately, said closure means. when open, respectively serving as bafiles to prevent the direct outward radiation of furnace heat.

15. The combination, in a liquid fuel furnace, of separate air supply means therefor of different capacities, respective axially movable closure means for closing said sup ply means successively, hand actuable means to operate said respective closure means for successive closing thereof, 'and connecting means between said closure means operable to open one of said closure means in the continued outward movement of the other closure means after the opening thereof.

16. The combination, in a liquid fuel furnace, of an air supply tube of relatively large diameter, an air supply tube of relatively small diameter, said smaller supply tube lying in spaced relation within said larger supply tube to provide adelivery passage for the latter, an air control ring movable to open and close said delivery passage, a cover plate movable toward and from said air control ring, and means for locking sai. cover plate in spaced relation from said air control ring.

17. A burner apparatus for liquid fuel furnaces having a pair of spaced concentric air supply tubes, an annular plate movable toward and from said tubes to close and open the outer end of. the space between the tubes, said plate provided with a central opening, means to close the opening in the annular 6. plate and thereby control the flow of air through the'inner of said concentric tubes, and means to move said annular plate and last mentioned means in succession.

18. A burner apparatus for liquid fuel furnaces having a pair of air supply tubes, one of said tubes being housed within the other to provide an air passage between the two, an annular plate movable axially of said tubes to approach and recede from the outer end of the space between the tubes whereby to regulate the flow of air therethrough, said annular plate having a central clearance to expose the opening through the inner tube, and guide means for said annular plate extended from one of said supply tubes. 3 l

19. A burner apparatus for liquid fuel furnaces. having a pair of air supply tubes concentrically arranged to provide an annular air passage and a central air passage, the rear ends of said tubes being flush with each other, an annular plate movable toward and from said rear ends to cover and uncover the space between said tubes, said annular plate'having a central clearance to expose the central air passage, and guide means for said annular plate extended from one of said supply tubes.

20. A burner apparatus for liquid fuel furnaces-having a pair of air supply tubes concentrically arranged to provide an annular air passage and a central air passage, the rear ends of said tubes being flush with each other, an annular plate movable toward and from cover the space between said tubes, said annular plate having a central clearance to exsaid rear ends to cover and unmeagre"? pose the central air passage, guide means for said annular plate extended from one of said supply tubes,and means independent of said plate for closing the inner tube.

21. A burner. apparatus for liquid fuel furnaces having a pair of air supply tubes concentrically arranged to provide an annular air passage and a central air passage, the rear ends of said tubes being flush with each other, anannular plate movable toward and from said rear ends to cover and uncover the space between said tubes, said annular plate having acentral clearance to expose the central air passage and being of greater diameter than the outer tube whereby to project therebeyond, and guide means for said annular plate extended from one ofsaid supply tubes.

burner apparatus for liquid fuel 1 furnaces having a pair of air supply tubes concentrically arranged to provide an annular air passage and a central air passage, the rear ends of said tubes being flush with each other, an annular plate movable. toward and from said rear ends to cover and uncover the space between'said tubes, said annular plate having a central'clearance to expose the central air passage and being of greater diameter than the outer tube whereby to project therebeyond, said projection portion being inclined forwardly with respect to the body of 'said plate, and guide means for said annular plate extended from one of said sup ply tubes. i

Executed this 13th day of September,

J AMES MCDONALD. 

